ASTM A789 S31803 Duplex Steel Seamless Tube for Hext Exchanger HT/ECT Available

ASTM A789 Duplex Steel Seamless Tube HT/ECT Available

ASTM A789 S31803 is a specification for duplex stainless steel tubes. Duplex stainless steel is a type of stainless steel that combines the desirable properties of both austenitic and ferritic stainless steels. It contains a high level of chromium and molybdenum, which provides excellent resistance to corrosion, particularly in environments with chloride ions.

ASTM A789 S31803 tube is specifically made from the duplex stainless steel grade S31803, which has a composition of approximately 22% chromium, 3% molybdenum, and 5-6% nickel. This grade offers good mechanical properties, high strength, and improved resistance to stress corrosion cracking.

These tubes are commonly used in various industries, including oil and gas, chemical processing, desalination, and marine applications. They are typically used for transporting fluids and gases in harsh environments where corrosion resistance is critical, such as offshore installations, heat exchangers, and condensers.

ASTM A789 S31803 tubes are manufactured through processes such as hot or cold rolling, welding, and seamless or welded fabrication, depending on the specific requirements. They are available in different sizes, lengths, and wall thicknesses to suit different applications.

Advantages:

1.High strength: The tube has superior strength compared to other stainless steel tubes, making it suitable for applications that require high tensile and yield strength.

2.Corrosion resistance: The tube is highly resistant to corrosion in various environments, including acidic and chloride-containing environments. This makes it suitable for applications in industries such as chemical processing, oil and gas, and marine.

3.Duplex structure: The tube possesses a dual-phase microstructure, consisting of roughly equal proportions of ferrite and austenite. This structure provides excellent mechanical properties and enhanced corrosion resistance.

4.Cost-effective: The tube's high strength and corrosion resistance make it a cost-effective alternative to other stainless steel materials with similar properties. This is especially advantageous in the long term, as it reduces maintenance and replacement costs.

5.Weldability: The ASTM A789 S31803 tube has good weldability, allowing for easy fabrication and installation. It can be welded using common processes such as TIG (tungsten inert gas) or MIG (metal inert gas) welding.

Application:

1. Heat Exchanger

2. Boiler

3. Oil and gas